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Showing 1 to 20 of 91 for “"Humic acid"”.
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Interaction Between Humic Acid and DNA
<p>Humic acid (HA) are widely dispersed, naturally occurring biopolymers most commonly found in soil, drinking water, and plants. Humic acid is soluble in alkali and insoluble in an acidic medium or water. In the present study the interaction of Humic acid with DNA is determined by the calculation …
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Amide and Ester-Functionalized Humic Acid for Fuel Combustion Enhancement
Humic acid is a class of naturally occurring molecules composed of large sheet-like regions of cyclic aromatic hydrocarbon networks with surface and edge functional groups including phenols, carboxylic acids, and epoxides. These naturally occurring molecules are found in brown coal deposits near …
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Copper binding ability of Suwannee River Humic Acid in seawater
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2000.
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Toxicity of chlorpyrifos adsorbed on clay and humic acid to larval walleye
… the bioavailability of chlorpyrifos adsorbed on humic acid (HA) and Panther Creek (PC) clay to larval walleye (Stizostedion vitreum), and (4) determine the toxicity of Cedar River sediments and water to larval walleye. Water temperature, stress, and the method of euthanasia had no effect on ChE …
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Effect of operating parameter on membrane distillation performance using kapok fibre for humic acid treatment
… parameters in membrane distillation for humic acid in terms of water permeability and rejection rate, and finally to determine the reusability of kapok fibre in the membrane distillation system. The physical properties of the raw kapok fibre have been determined with respect to …
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Theoretical copper sulfate dosing;the effect of alkalinity and humic acid on ionic copper toxicity to algae
… freshwater. Concentrations of alkalinity and humic acid were varied to study their effect on percentages of ionic copper available. Long-term (2 weeks) growth-rate studies were performed to study the effect of humic acid on the toxicity of ionic copper to algae. Some protection of algae from …
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Evaluation of reactive cap sorbents for in-situ remediation of contaminated sediments
… study investigated the interferences caused by humic acid on the adsorption of co-planar and non-co-planar polychlorinated biphenyls (PCBs) including 2-chlorobiphenyl, 2, 2', 5, 5'-tetrachlorobiphenyl, 3, 3', 4, 4'-tetrachlorobiphenyl, 2, 2', 4, 4', 5, 5'-hexachlorobiphenyl and 3, 3', 4, 4', 5, …
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Influence of organic matter on the sorption and bioavailability of 2,4,6-trichloro-(¹⁴C)-phenol
… organic soils, and dissolved macromolecules (humic acid). Microbial utilization of 2,4,6-TCP was then evaluated after addition of a bacterial culture previously acclimated to the substrate. Biodegradation was evaluated by production of ¹⁴CO₂ and disappearance of 2,4,6-TCP from the sorbed and …
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INTERACTION OF POLYCYCLIC AROMATIC HYDROCARBONS WITH DISSOLVED AND SEDIMENT ASSOCIATED HUMIC MATERIALS (NMR, FLUORESCENCE)
… (PAH)s with dissolved and sediment bound humic materials. The technique is based upon the observation that PAH fluorescence in aqueous solution is quenched upon association with humic material. Association constants are derived from the fractional decrease in fluorescence intensity as a …
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Effectiveness of water treatment methods for removal of haloforms and their precursors
Using a simulated lake water containing humic acid, various combinations of water treatment processes were utilized to determine their effect on precursor removal and haloform removal subsequent to their formation. Laboratory tests t including temperature, pH, alkalinity, absorbance, and chlorine …
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The Nature of Some Bituminous Sands from Moffat County, Colorado
<p>Humic acid is a possible cause of the staining found in many sands has been seemingly overlooked in the past. It is a definite cause, and very probably to a much greater extent than realized. </p><p>Two samples from the Browns Park Formation appear naturally brown in color, but are in reality …
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The Effects of Known PCR Inhibitors on Droplet Digital PCR Performance
… melanin), absorbed from the environment (humic acid, indigo dye)1, or introduced during laboratory processing (phenol1 , glove powder2). Human DNA quantification kits using quantitative real-time PCR (qPCR) instrumentation, the current standard for the quantification of DNA, are used to …
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Purification of human dna for dna profiling from body fluid contaminated soil using superparamagnetic iron oxide nanoparticles (spions).
… samples is difficult due to the co-extraction of humic acid and phenolic compounds which can inhibit downstream DNA profiling of samples. Several methods are available for DNA extraction from soil including a number of commercially available kits. We used varying amounts (5 mg to 250 mg) of soil …
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Influence of Plant Growth Regulators on Turfgrass Growth, Antioxidant Status, and Drought Tolerance
… seaweed (Ascophyllum nodosum) extracts (SE) and humic acid (HA; 25% active HA or 2.9% active HA) in tall fescue (Festuca arundinacea Schreb), Kentucky bluegrass (Poa pratensis L.) and creeping bentgrass (Agrostis palusttis Huds.) grown under low (-0.5 MPa) and high (-0.03 MPa) soil moisture …
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Natürliche Bildung von halogenierten Essigsäuren und Iodalkanen
… occurrence and sinks of halogenated acetic acids (HAAs), which are phytotoxic, and probably related to forest dieback, is summarized. They are ubiquitous in precipitations and are accumulated in coniferous needles. Next to anthropogenic sources there have also been indications of a natural …
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Targeted Degradation of Trinitrotoluene Using Iron (II)-Cyclodextrin-Peroxide Systems
… in water system with interfering substance - humic acid, which tends to associate with TNT, the addition of cyclodextrin helped to improve the efficiency of Fenton degradation. This technique has also been successfully applied to remediate TNT contaminated soil systems (sand). Four systems …
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Characterization of black deposit associated with rock paintings in Little Lost River Cave, Idaho using Pyrolysis GC
… samples of the black coating from Idaho to humic acid, a geologic material; an experimental cooking residue; and amberat from packrats. The results show that the coating is not amberat but bears the most similarity to humic acid, which would indicate a geologic origin for the coating. The …
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The development of a novel and potentially nondestructive pretreatment for the radiocarbon dating of archaeological artifacts
<p>Because the traditional acid-alkali-acid method for pretreating archaeological artifacts prior to radiocarbon dating is destructive to most materials, the possibility of developing an alternative pretreatment is important to preserving culturally- and historically-significant artifacts. The …
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